Bolt-gun



T. C. JOHNSON.

BOLT GUN.

APPLICATION FILED MAR. 25, 1919.

Patented Mar. 30, 1920.

UNITED TATES PATENT OFFICE.

THOMAS C. JOHNSON, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO WINCHESTER REPEATING- ARMS CO., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

BOLT-GUN.

Specification of Letters Patent.

Patented Mar. 30, 1920.

Application filed March 25, 1919. Serial No. 284,916.

To all whom it may concern:

Be it known that I, THOMAS C. JOHNSON, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Bolt-Guns; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear,

and exact description of the same, and which said drawings constitute part of th1s application, and represent, in

Figure l a broken view in right hand s de elevation of a bolt-gun embodying my invention, showing the bolt in its closed position.

Fig. 2 a view thereof in transverse section on the line 22 of Fig. 1.

Fig. 3 a broken view thereof in side elevation, showing the bolt in its open position.

Fig. 4 a detached broken view of the receiver in vertical longitudinal section.

Fig. 5 a detached broken sectional view of the reduced and threaded breech-end of the barrel.

Fig. 6 a detached broken view of the forward end of the bolt partly in plan and partly in horizontal section, showing the cartridge extractors.

Fig. 7 a detached broken side view of the bolt.

Fig. 8 a view thereof in front elevation.

Fig. 9 a detached side view of the bolt- 'uide.

b Fig. 10 an end view thereof.

My invention relates to an improvement in bolt-guns, the object being to simplify and cheapen the construction of guns of this type with particular reference to guiding the bolt and holding it against rotation.

With these ends in view, my invention consists in a bolt-gun having certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

In carrying out my invention as herein shown, I employ a bolt 3 which is a true bolt in the sense that it is round in crosssection, this bolt being housed for longitudinal movement in a circular bolt-chamber 1 in the receiver 5 which has a transverse loading-opening 6. The lower face of the forward end ofthe bolt is horizontally cut away at a point just below its center to form a flat bearing-face 7. An integral axially arranged cartridge-loading rib 9 depending from the said bearing-face 7 enters a longitudinal groove 10 formed in the fiat up per bearing-face 11 of a bolt-guide 12 the curved lower face 13 of which conforms to the curvature of the bolt-chamber 1 in the receiver. An upstanding ejecting-rib 14 integral with the bolt-guide and in line therewith, enters a corresponding clearance groove 15 in the bearing-face 7 of the bolt and serves to eject the spent cartridges through the loading-opening 6, the heads of the spent cartridges being impinged upon the forward end of the said rib at the right moment during the rearward excursion of the bolt. The bolt-guide 12 is solidly secured in place by means of a screw 16 passing up into it through a screw hole 17 in the floor of the bolt-chamber 4.

At opposite points above the bearing-face 7 of the bolt and in line with its axis, it is formed with two horizontally arranged slots 18 for the reception of extractors 19 hung on pins 20, the hooklike forward ends of the said extractors extending beyond the forward face 21 of the bolt. Two helical springs 22 located in transverse holes 23 in the bolt are provided for the operation of the extractors. The breech end of the gunbarrel 24L is reduced in diameter and thread ed as at 25 for engagement with threads 26 within the forward end of the receiver, the extreme rear end of the barrel being formed with clearance slots 27 for the reception of the said hook-like ends of the extractors which are thus permitted to engage with the heads or rims of the spent cartridges.

By my improved construction, I provide simple and cheap means for guiding and preventing the rotation of bolts of the true bolt type, that is, bolts of circular crosssection.

I claim 1. A bolt-gun having its receiver formed with a circular bolt-chamber, a bolt having the lower face of its forward end cut away and provided with a depending longitudinal cartridge-loading rib, and a bolt-guide located within the forward end of the boltchamber, coacting with the bolt to prevent the rotation thereof and having a longitudinal groove for the reception of the said rib which slides back and forth in the said groove with the movement of the bolt.

2. A bolt-gun having its receiver formed with a circular bolt-chamber, a bolt having the lower face of its forward end cut away to form a fiat bearing-face from which a cartridge-loading rib depends, and a boltguide having a flat upper bearing face formed with a groove for the reception of the said rib and having its lower face conformed to the curvature of the bolt-chamber in which it is rigidly secured.

3. A bolt-gun having its receiver formed with a circular bolt-chamber, a bolt having the lower face of its forward end cut away to form a flat bearing-face from which a longitudinally arranged cartridge loading rib depends and which has a groove extending alongside of the said rib, and a boltguide located within the forward end of the said bolt-chamber and having a longitudinal groove for the reception of said rib and an upstanding cartridge-ejecting rib entering the said groove in the bolt, the lower face of the said guide being conformed to the curvature of the bolt-chamber to the floor of which it is rigidly secured.

4. In a bolt-gun, the combination with a receiver having a circular bolt-chamber, of

a bolt having thelower face of its forward end cut away to form a bearing-face from which a cartridge-loading rib depends and which is furnished with a groove, of a boltguide secured within the said receiver and having a flat upper bearing-face complementing the bearingface of the bolt, a rounded lower face conforming to the curvature of the bolt-chamber in the said re-. ceiver, and formed with a groove for the reception of the said cartridge-loading rib.

5. In a bolt-gun, the combination with a receiver having a circular bolt-chamber, of a bolt having the lower face of its forward end cut away to form a bearing-face from which a cartridge loading rib depends, and having oppositely located longitudinal grooves formed above the said face, a boltguide securedto the floor of the said boltchamber and having a longitudinal groove for the reception of the said rib, and two spring-actuated pivotal extractors located in the said grooves in the bolt.

' In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

- THOMAS C. JOHNSON.

Witnesses:

ERIK S. PALMER, ARTHUR W. EARLE. 

